<template>
	<!-- 分类 -->
	<view>
		<!-- 搜索栏 -->
		<my-search :bgcolor="'pink'" @click='gotoSearch'></my-search>

		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">

				<!-- <block></block> 是一个包裹性质的容器，不会再页面上渲染-->
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i===active?'active':'']" @click="activeChanged(i)">
						{{item.cat_name}}
					</view>
				</block>
			</scroll-view>

			<!-- 右侧滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<!-- 动态渲染三级分类 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3"
							@click="gotoGoodsList(item3.cat_id)">
							<image :src="item3.cat_icon.replace('dev','web')"></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>

		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				wh: 0,
				// 分类数据列表
				cateList: [],
				// 当前选中项的索引，默认让第一项被选中
				active: 0,
				// 二级分类列表
				cateLevel2: [],
				scollTop: 0,
			};
		},

		onLoad() {
			// 获取当前手机设备信息
			const sysInfo = uni.getSystemInfoSync()
			// console.log(sysInfo);
			this.wh = sysInfo.windowHeight - 50

			this.getCateList()

		},
		methods: {
			// 调用获取分类列表数据
			async getCateList() {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status != 200) return uni.$showMsg()
				// console.log(res);
				this.cateList = res.message
				// 为二级分类赋值
				this.cateLevel2 = res.message[0].children

			},

			activeChanged(i) {
				this.active = i
				// 重新为二级分类赋值
				this.cateLevel2 = this.cateList[i].children

				this.scollTop = this.scollTop === 0 ? 1 : 0
			},

			// 点击三级分类跳转详情页
			gotoGoodsList(cid) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + cid
				})
			},

			gotoSearch() {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			},

		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120rpx;

			.left-scroll-view-item {
				background-color: #f7f7f7;
				line-height: 60px;
				text-align: center;
				font-size: 20rpx;

				&.active {
					background-color: #FFFFFF;
					position: relative;

					&::before {
						content: '';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #C00000;
						position: absolute;
						top: 50%;
						left: 0;
						transform: translateY(-50%);
					}
				}

			}
		}
	}

	// 二级分类标题
	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}

	// 三级分类
	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;

		.cate-lv3-item {
			width: 33.33%;
			margin-bottom: 10px;
			display: flex;
			flex-direction: column;
			align-items: center;

			image {
				width: 60px;
				height: 60px;
			}

			text {
				font-size: 12px;
			}
		}
	}
</style>
